Wojciech Bujalski | Warsaw University of Technology (original) (raw)
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Papers by Wojciech Bujalski
Energy Procedia, 2014
The article presents an analysis of real operational data of a Seasonal Thermal Energy Storage sy... more The article presents an analysis of real operational data of a Seasonal Thermal Energy Storage system connected to a local heating grid. 8 years of operation time was analyzed to determine typical scenarios for cooperation with the heating grid and solar collectors and transient modes, and that the maximum speed of charge/discharge is on average below 0.3 C/day.
Energy Conversion and Management, 1995
Increasing electricity requirements in residential sector create a possible market for small coge... more Increasing electricity requirements in residential sector create a possible market for small cogeneration systems. Such a system can be based on a new and highly efficient technology such as high temperature fuel cells. Mathematical modeling is a low cost and effective method for analyzing possible operation strategies and system economical results. The objective of this paper was to present the simulation results of operation of a micro CHP system based on a SOFC in Polish reality. The model of SOFC based micro-CHP system was developed. Based on this model the technical and economical analysis was performed. The results of sensitivity analysis established a SOFC performance variation with utilities price changes. Moreover, the optimum of a micro-CHP system was found to be 1 kW.
Applied Mechanics and Materials, 2013
The paper presents a theoretical investigation of using a Seasonal Thermal Energy Storage facilit... more The paper presents a theoretical investigation of using a Seasonal Thermal Energy Storage facility (STES) to cover the heat demand of a complex of four buildings. The STES is placed in the ground and connected to both the local district heating network and solar panels. A number of scenarios were investigated to find an adequate size of the STES (tank size and solar panel area.) The results obtained show that the use of a STES could reduce heat consumption by 22100% depending on the architecture solution chosen.
Increasing electricity requirements in the residential sector open up a possible market for small... more Increasing electricity requirements in the residential sector open up a possible market for small cogeneration systems. A system of this type can be based on new, highly efficient technology such as high temperature fuel cells. Mathematical modeling is a low cost and effective method for analyzing possible operation strategies and commercial results for the system. The objective of this paper was to present the simulation results of operation of a micro CHP system based on an SOFC in Polish circumstances. The model of an SOFC-based micro-CHP system was developed. Based on this model a technical and commercial analysis was performed. The results of sensitivity analysis established SOFC performance variation with changes in the prices of utilities. The optimum micro-CHP system was found to be 1 kW.
Applied Mechanics and Materials, 2013
The paper presents an experimental investigation of using a Molten Carbonate Fuel Cell (MCFC) for... more The paper presents an experimental investigation of using a Molten Carbonate Fuel Cell (MCFC) for reducing CO2 emission from the flue gas of a lignite boiler. The MCFC is placed in the flue gas stream and separates CO2 from the cathode side to the anode side. As a result, a mixture of CO2 and H2O is obtained; from which pure CO2 can be obtained by cryogenic condensation of water and carbon dioxide. The main advantages of this solution are: additional electricity generated, reduced CO2 emissions and higher system efficiency. The results obtained show that the use of an MCFC could reduce CO2 emissions by 90% with over 30% efficiency in additional power generation.
Energy Procedia, 2014
The article presents an analysis of real operational data of a Seasonal Thermal Energy Storage sy... more The article presents an analysis of real operational data of a Seasonal Thermal Energy Storage system connected to a local heating grid. 8 years of operation time was analyzed to determine typical scenarios for cooperation with the heating grid and solar collectors and transient modes, and that the maximum speed of charge/discharge is on average below 0.3 C/day.
Energy Conversion and Management, 1995
Increasing electricity requirements in residential sector create a possible market for small coge... more Increasing electricity requirements in residential sector create a possible market for small cogeneration systems. Such a system can be based on a new and highly efficient technology such as high temperature fuel cells. Mathematical modeling is a low cost and effective method for analyzing possible operation strategies and system economical results. The objective of this paper was to present the simulation results of operation of a micro CHP system based on a SOFC in Polish reality. The model of SOFC based micro-CHP system was developed. Based on this model the technical and economical analysis was performed. The results of sensitivity analysis established a SOFC performance variation with utilities price changes. Moreover, the optimum of a micro-CHP system was found to be 1 kW.
Applied Mechanics and Materials, 2013
The paper presents a theoretical investigation of using a Seasonal Thermal Energy Storage facilit... more The paper presents a theoretical investigation of using a Seasonal Thermal Energy Storage facility (STES) to cover the heat demand of a complex of four buildings. The STES is placed in the ground and connected to both the local district heating network and solar panels. A number of scenarios were investigated to find an adequate size of the STES (tank size and solar panel area.) The results obtained show that the use of a STES could reduce heat consumption by 22100% depending on the architecture solution chosen.
Increasing electricity requirements in the residential sector open up a possible market for small... more Increasing electricity requirements in the residential sector open up a possible market for small cogeneration systems. A system of this type can be based on new, highly efficient technology such as high temperature fuel cells. Mathematical modeling is a low cost and effective method for analyzing possible operation strategies and commercial results for the system. The objective of this paper was to present the simulation results of operation of a micro CHP system based on an SOFC in Polish circumstances. The model of an SOFC-based micro-CHP system was developed. Based on this model a technical and commercial analysis was performed. The results of sensitivity analysis established SOFC performance variation with changes in the prices of utilities. The optimum micro-CHP system was found to be 1 kW.
Applied Mechanics and Materials, 2013
The paper presents an experimental investigation of using a Molten Carbonate Fuel Cell (MCFC) for... more The paper presents an experimental investigation of using a Molten Carbonate Fuel Cell (MCFC) for reducing CO2 emission from the flue gas of a lignite boiler. The MCFC is placed in the flue gas stream and separates CO2 from the cathode side to the anode side. As a result, a mixture of CO2 and H2O is obtained; from which pure CO2 can be obtained by cryogenic condensation of water and carbon dioxide. The main advantages of this solution are: additional electricity generated, reduced CO2 emissions and higher system efficiency. The results obtained show that the use of an MCFC could reduce CO2 emissions by 90% with over 30% efficiency in additional power generation.